JPH06891B2 - Aromatic polysulfone resin composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to an aromatic polysulfone resin composition having excellent impact properties.

<Prior Art> Aromatic polysulfone is an engineering plastic excellent in heat resistance, strength and rigidity, flame retardancy, and creep resistance, and electric and electronic parts, automobile parts, and OA equipment parts that are required to be thin and compact these days. It is drawing attention in applications such as.

However, in terms of impact strength, although it has a higher value than polyetherimide or polyphenylene sulfide having equivalent heat resistance, it has poor ductility and is fragile as compared to polycarbonate or polyarylene ester, and in terms of the application aspect. May be subject to restrictions.

<Problems to be Solved by the Invention> An object of the present invention is to provide a composition having improved impact strength without lowering the heat resistance and rigidity of aromatic polysulfone.

<Means for Solving Problems> The inventors of the present invention have made diligent studies in view of the above situation, and as a result, ethylene containing an aromatic polysulfone, an α, β-unsaturated carboxylic acid alkyl ester, and maleic anhydride was used. The present inventors have found that a composition having excellent impact properties can be obtained without reducing the heat resistance and rigidity of the aromatic polysulfone by blending the copolymer, and have reached the present invention.

That is, the present invention relates to (A) aromatic polysulfone 70 to 9
9% by weight and (B) ethylene 50 to 90% by weight, α, β
A resin composition comprising an ethylene copolymer of 5 to 49% by weight and an ethylene copolymer of 0.5 to 10% by weight and an ethylene copolymer of 30 to 1% by weight.

The aromatic polysulfone used as a component of the composition of the present invention is defined as a polyarylene compound in which the arylene units are randomly or ordered with ether and sulfone bonds. For example, the following (1) ~ (1
There are those consisting of structural formulas such as 6), but especially
Those having the structures (1), (2), and (6) are preferable because they have a good balance of physical properties and workability.

Furthermore, when the reduced viscosity measured at 25 ° C. is 0.3 or more and 0.6 or less for a dimethylformamide solution containing 1 g of the polymer in 100 cc of the solution, the aromatic polysulfone has physical properties such as heat resistance, strength, rigidity and toughness. It is more preferable because it has a good balance of molding processability.

The ethylene copolymer used in the present invention has a monomer component composed of ethylene, an α, β-unsaturated carboxylic acid alkyl ester, and maleic anhydride, wherein ethylene is 5
0 to 90% by weight, preferably 60 to 85% by weight, α, β
5 to 49% by weight, preferably 7 to 45% by weight of unsaturated carboxylic acid alkyl esters, and 0.5 to 10% by weight, preferably 1 to 8% by weight of maleic anhydride.

The α, β-unsaturated carboxylic acid alkyl ester is an unsaturated carboxylic acid having 3 to 8 carbon atoms, for example, acrylic acid,
An alkyl ester such as methacrylic acid, and specific examples thereof include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, t-butyl acrylate, isobutyl acrylate, methacrylic acid. Methyl acid, ethyl methacrylate,
There are n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, t-butyl methacrylate, isobutyl methacrylate, and the like. Among these, ethyl acrylate, n-butyl acrylate, and methyl methacrylate are particularly preferable. preferable.

The amount of the ethylene copolymer to be blended with the aromatic polysulfone is 70 to 99% by weight of the aromatic polysulfone and 80 to 1% of the ethylene copolymer based on the total amount of the aromatic polysulfone and the ethylene copolymer. Wt% is appropriate,
When the amount of aromatic polysulfone exceeds 99% by weight and the amount of the ethylene copolymer is less than 1% by weight, the effect of improving the desired impact strength is insufficient, and the amount of aromatic polysulfone is less than 70% by weight. When the ethylene copolymer exceeds 80% by weight, the heat resistance and the rigidity, which are the characteristics of the aromatic polysulfone, are significantly lowered, which is not preferable.

The compounding means of the composition of the present invention is not particularly limited.

It is possible to supply them separately to the melt mixer, or it is possible to pre-mix these raw materials using a mortar, a Henschel mixer, a ball mill, a repon blender, etc. before supplying them to the melt mixer.

Incidentally, with respect to the composition of the present invention, within a range that does not impair the object of the present invention, antioxidants and heat stabilizers, ultraviolet absorbers, lubricants, release agents, dyes, colorants such as pigments, flame retardants,
One or more conventional additives such as flame retardant aids and antistatic agents can be added.

Also, small amounts of other thermoplastics (eg polyethylene,
Polypropylene, polyamide, polycarbonate, polyarylene ester, modified polyphenylene oxide,
Etc.), and one or more thermosetting resins (for example, phenol resin, epoxy resin, etc.) can be added.

Furthermore, reinforcing agents such as glass fiber, carbon fiber, boron fiber, silicon carbide fiber, asbestos fiber and metal fiber,
It is also possible to blend a filler such as clay, mica, silica, graphite, glass beads, alumina and calcium carbonate.

In particular, glass fiber or carbon fiber has a remarkable effect of improving rigidity and heat resistance due to the filling thereof, and in order to provide a more useful composition, 10 to 6 relative to the entire composition.
It is preferable to fill in the range of 0 wt%. The fibers used are chopped strands or chopped fibers obtained by bundling hundreds to thousands of single fibers having a diameter of 5 to 15 μm and a length of 3 to 8 mm, or rovings which are long fibers, and the average fiber length in the final composition is 0.15 to It is preferable to disperse uniformly so as to be in the range of 0.5 mm.

Hereinafter, the present invention will be described with reference to examples, but these are merely examples and the present invention is not limited thereto.

Examples 1 to 8 As a basic structure A poly (ethylene sulfone 8600P manufactured by ICI) and an ethylene copolymer consisting of 67% of ethylene, 30.5% of ethyl acrylate and 2.5% of maleic anhydride were mixed in a composition shown in Table 1 and then biaxially extruded. Using a machine (PCM-30 manufactured by Ikegai Tekko Co., Ltd.), after melt-kneading at a temperature of 330 ° C., the strands were ice-cooled and cut to obtain pellets.

The obtained pellets were injection molded (Sumitomo Heavy Industries-Nestal
47/28 injection molding machine, cylinder temperature 340-360
℃, mold temperature 180 ℃), Izod impact strength test piece,
Bending test pieces and heat distortion temperature measurement test pieces were obtained.

ASTM D-256, D-790, D-64 respectively
It measured according to 8. (Results are shown in Table 1) Excellent values were obtained in all cases.

Comparative Examples 1 to 2 The aromatic polysulfone used in Examples 1 to 3 and the ethylene copolymer were mixed in the proportions shown in Table 1 to give Examples 1 to 3.
The same processing was performed and the physical properties were measured. (Results are shown in Table 1) Remarkably inferior to the examples.

Examples 4 to 6 As basic structure Polysulfone with UCC (Udelp170
0) and the ethylene copolymers used in Examples 1 to 3 were mixed in a composition shown in Table 2, pelletized by the same method as in Examples 1 to 3, and injection molded to obtain Izod impact strength test pieces. Bending test pieces and heat distortion temperature measurement test pieces were obtained and provided for measurement.

At this time, the extrusion temperature was 300 ° C., the injection molding was performed at a cylinder temperature of 330 to 350 ° C., and the mold temperature was 130 ° C.

The results are shown in Table 2.

Comparative Examples 3 to 4 The polysulfone used in Examples 4 to 6 and the ethylene copolymer were mixed in the proportions shown in Table 2, and the same processing as in Examples 4 to 6 was performed to measure the physical properties.

The results are shown in Table 2. It is significantly inferior to the examples.

Examples 7 to 8 Polyethylene sulfone having the same structure as in Examples 1 to 3, ethylene 75.5%, ethylene copolymer consisting of ethyl acrylate 22.5% and maleic anhydride 2.0%, and glass fiber (CS03 manufactured by Asahi Fiber Glass Co., Ltd.). -MA49
7, chopped strands with a length of 3 mm) were mixed in the composition shown in Table 3 and a twin-screw extruder (PCM-3 manufactured by Ikegai Tekko Co., Ltd.) was mixed.
According to 0), after melt-kneading at a temperature of 340 ° C., the strand was water-cooled and cut to obtain pellets.

The obtained pellets were injection molded (Sumitomo Heavy Industries-Nestal
47/28 injection molding machine, cylinder temperature 350 ° C., mold temperature 130 ° C.), Izod impact test piece, bending test piece, and test piece for measuring heat distortion temperature were obtained. Each ASTM D-2
56, D-790, D-648.

The results are shown in Table 3.

Comparative Example 5 The polyether sulfone used in Examples 7 to 8 and glass fiber were mixed in the proportions shown in Table 3, the same processing as in Examples 7 to 8 was performed, and the physical properties were measured. (The results are shown in Table 3.) Remarkably inferior to the examples.

<Effect of the Invention> Ethylene, α, β are added to the aromatic polyflufon resin of the present invention.
A composition containing an ethylene copolymer composed of an unsaturated carboxylic acid alkyl ester and maleic anhydride has a markedly improved impact strength without lowering the heat resistance and rigidity of the aromatic polysulfone resin.

Claims (1)

[Claims] 1. (A) 70 to 99% by weight of aromatic polysulfone and (B) 50 to 90% by weight of ethylene, 5 to 49% by weight of α, β-unsaturated carboxylic acid alkyl ester and 0.5 to 10 of maleic anhydride. Ethylene copolymer 30% by weight
A resin composition comprising 1% by weight.